Sensitive groups:Reduce prolonged or heavy outdoor exertion. Take more breaks and do less intense activities. Watch for symptoms like coughing or shortness of breath. If ozone levels are high, schedule outdoor activities for the morning or evening when ozone is lower.

People with asthma should follow their asthma action plans and keep quick-relief medicine on-hand.

Everyone else: Reduce prolonged or heavy outdoor exertion. Take more breaks and do less intense activities. If ozone levels are high, schedule outdoor activities for the morning or evening when ozone is lower.

You are asked to voluntarily not use solid fuel burning devices, including wood and coal burning stoves and fireplaces; reduce or stop open burning; and TravelWise by consolidating trips. Industry should optimize operations to minimize air polluting emissions.

Mandatory Action

Solid fuel burning devices must not be used, including wood and coal burning stoves and fireplaces. Open burning may not occur, including fire pits, fire rings, and campfires. TravelWise by consolidating trips. Industry should optimize operations to minimize air polluting emissions.

The AQI is an index for reporting daily air quality developed by the EPA. It is separately calculated for four major air pollutants regulated by the Clean Air Act: ozone, particulate matter (PM), sulfur dioxide, and carbon monoxide. The highest among all four of these AQI numbers calculated in an area is reported as the AQI value for that day.

In Utah, air quality is typically reported using the actual pollutant concentrations and reflects levels of ozone or particulate matter. Typically, when one of these air pollutants is high, the other is low. For example, PM pollution is typically highest in the winter, which is when ozone pollution is usually lowest. There are occasions when both may be high (e.g., high summertime ozone and simultaneous high PM caused by wildfires). During these kinds of conditions, the likelihood of experiencing symptoms may be higher than indicated by these charts.

The AQI was developed using available scientific knowledge on average adverse health effects after acute exposure among a population. Individuals may be more or less sensitive. Base your interpretation of the current air quality conditions on your personal experience and history of symptoms under past similar air quality conditions.